You can install it yourself no problem.
Or any hi-fi stereo audio shop, it's pretty straight forward..it's like installing parts of an audio system
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You have to find the BMW amplifier in the trunk, passanger side.
Just take two pins out of that plug, insert the pins provided in the kit instead.
Also you need to route a wire provided in the kit from the fuse box ( in the front passanger side under the glove compartment) to the trunk. We found out it's pretty easy to route it along the car wires under the door sils. This will power up the maserati sound ecu.
Then just plug everything togheter, download the app and enjoy the V8 sound
We found a company that put the hole kit togheter (like the last picture I posted), until then we bought piece by piece and everytime we found out we were still missing something.
I can send you their contact details, pm me.
I think they can send you the install instructions in english as well.